Листовка для Steca Solar charge controller 12 V, 24 V 6 A Steca Solsum 6.6 F 302899

Operating manual 

Solar charge controller 
10.10 A / 8.8 A / 6.6 A 

 

 

These operating instructions are part of the product. Read these operating instructions 
carefully before use, keep them over the entire lifetime of the product, and pass them on to 
any future owner or user of this product. 
This manual describes the installation, function, operation and maintenance of the solar 
charge controller. These operating instructions are intended for end customers.  
A technical expert must be consulted in cases of uncertainty. 
 

The solar charge controller may only be used in PV systems for charging and controlling 
lead-acid batteries in accordance with this operating manual and the charging 
specifications of the battery manufacturer. 
The solar charge controller may only be connected to the local loads and the battery by 
trained personnel and in accordance with the applicable regulations. Follow the installation 
and operating instructions for all components of the PV system. 
No energy source other than a solar generator may be connected to the solar charge 
controller. Follow the general and national safety and accident prevention regulations. 
Keep children away from PV systems. Do not use the solar charge controller in dusty 
environments, in the vicinity of solvents or where inflammable gases and vapours can 
occur. No open fires, flames or sparks in the vicinity of the batteries. Ensure that the room 
is adequately ventilated. Check the charging process regularly. 
Follow the charging instructions of the battery manufacturer. Battery Acid splashes on skin 
or clothing should be immediately rinse with plenty of water. Seek medical advice.  
Do not operate the solar charge controller when it does not appear to function at all. The 
solar charge controller or connected cables are visibly damaged or loose. In these cases 
immediately remove the solar charge controller from the solar modules and battery. 
 

 

The solar charge controller monitors the state of charge of the battery bank, controls the 
charging process, controls the connection/disconnection of loads. This optimises battery 
use and significantly extends its service life. 
The following protection functions are part of the basic function of the controller:  
Overcharge protection ; Deep discharge protection ; Battery undervoltage protection ; Solar 
module reverse current protection.  

 
 

4.1 Mounting location requirements 
Do not mount the solar charge controller outdoors or in wet rooms. Do not subject the solar 
charge controller to direct sunshine or other sources of heat. Protect the solar charge 
controller from dirt and moisture.  
Mount upright on the wall (concrete) on a non-flammable substrate. Maintain a minimum 
clearance of 10 cm below and around the device to ensure unhindered air circulation. 
Mount the solar charge controller as close as possible to the batteries (with a safety 
clearance of at least 30 cm). 
 
4.2 Fastening the solar charge controller 
Mark the position of the solar charge controller fastening holes on the wall.  
Drill 4 Ø 6 mm holes and insert dowels. Fasten the solar charge controller to the wall with 
the cable openings facing downwards, using 4 oval head screws M4x40 (DIN 7996). 
 
4.3 Connection 
Use an wire size suited to the current ratings of the charge controller, e.g. 6mm² for 10A, 5 
mm² for 8A, 4 mm² for 6A, 3 mm² for 5A for cable length of 10 m. 
An additional external 20A fuse (not provided) must be connected to the battery connection 
cable, close to the battery pole. The external fuse prevents cable short circuits. 
Solar modules generate electricity under incident light. The full voltage is present, even 
when the incident light levels are low. Protect the solar modules from incident light during 
installation, e.g. cover them.  
Never touch not isolated cable ends. Use only insulated tools. Ensure that all loads to be 
connected are switched off. If necessary, remove the fuse. 
Connections must always be made in the sequence described below. 

Info LED 

Battery LEDs 

Connect the battery connection cable with the 
correct polarity to the middle pair of terminals 
on the solar charge controller (with the battery 
symbol).  
If present, remove any external fuse. Connect 
battery connection cable A+ to the positive 
pole of the battery. Connect battery 
connection cable A– to the negative pole of 
the battery. Insert the external fuse in the 
battery connection cable. 
If the connection polarity is correct, the info 
LED illuminates green. 

 

 
2nd step: Connect the solar module 

Ensure that the solar module is protected from incident light (cover it or wait for night).  
Ensure that the solar module does not exceed the maximum permissible input current.  
First connect the M+ solar module connection cable to the correct pole of the left pair of 
terminals on the solar charge controller (with the solar module symbol), then connect the 
M– cable. Remove the covering from the solar module. 
 

First connect the L+ load cable to the correct pole of the right pair of terminals on the solar 
charge controller (with the lamp symbol), then connect the L– cable. Insert the load fuse or 
switch on the load.  
Notes :  Connect loads that must not be deactivated by the solar charge controller deep 
discharge protection, e.g. emergency lights or radio connection, directly to the battery. 
Loads with a higher current consumption than the device output can be directly connected 
to the battery. However, the solar charge controller deep discharge protection will no longer 
intervene. Loads connected in this manner must also be separately fused. 
 

Fasten all cables with strain relief in the direct vicinity of the solar charge controller 
(clearance of approx. 10 cm). 
 

 

illuminates green 

normal operation 

Info LED 

flashes slowly red* 

system fault 
- too high charging current 
- overload / short circuit 
- overheated 
together with red LED : 
- too low battery voltage 
together with green LED : 
- too high battery voltage 

flashing quickly* 
 

battery empty, low voltage disconnection  
prewarning, loads still on 

Battery 

red 

LED 

 

flashing slowly* 

deep discharge protection active (LVD), loads 
disconnected 

illuminates 

battery weak, loads are on 

Battery 

yellow 

LED 

flashes slowly yellow* 

LVD reconnection setpoint has not yet been 
reached, loads still disconnected 

illuminates 

battery good 

Battery 

green 

LED 

flashes slowly green* 

battery full, charge regulation active 

*flashing slowly: 0,4Hz: 4 times in 10 second, flashing quickly: 3Hz: 3 times in 1 second 

The components in stand-alone systems do not have to be grounded – this is not standard 
practice or may be prohibited by national regulations (e.g.: DIN 57100 Part 410: Prohibition 
of grounding protective low voltage circuits). Ask your dealer for technical assistance. 

 

In systems subjected to an increased risk of overvoltage damage, we recommend 
installing additional lightning protection / overvoltage protection to reduce dropouts.  
Ask your dealer for technical assistance. 

The solar charge controller is maintenance-free. 
All components of the PV system must be checked at least annually, according to the 
specifications of the respective manufacturers. Ensure adequate ventilation of the cooling 
element. Check the cable strain relief. Check that all cable connections are secure. Tighten 
screws if necessary. Check corrosion on terminals. 

9. Faults and remedies 

No display : Check battery polarity and external fuse. Or battery voltage is too low or 
battery defective. 

 

Battery is not charged : Check if solar modul is connected with correct polarity or if short 
circuit at the solar input. If solar module voltage is lower than battery voltage or if solar 
module is defective  the battery cannot be charged. 

 

Battery displays jumps quickly : Battery voltage changes quickly. Large pulse currents 
cause voltage fluctuation. Battery is too small or defective. Ask your dealer for technical 
assistance. 

 

The following faults do not destroy the controller. After correcting the fault, the device will 
continue to operate correctly: 
* solar module short circuits 

* reverse solar module polarity 

*2

 

* short circuits at load output 

* excessive load current 

* reversed battery polarity 

*1

  

* solar module overcurrent 

* device overtemperature   

* overvoltage at the load output 

 

According to the German legal requirements, for this product the customer has a 2 year 
legal guarantee. 
The seller will remove all manufacturing and material faults that occur in the product during 
the legal guarantee period and affect the correct functioning of the product. Natural wear 
and tear does not constitute a malfunction.  
Legal guarantee does not apply if the fault can be attributed to third parties, unprofessional 
installation or commissioning, incorrect or negligent handling, improper transport, excessive 
loading, use of improper equipment, faulty construction work, unsuitable construction 
location or improper operation or use.  
Legal guarantee claims shall only be accepted if notification of the fault is provided 
immediately after it is discovered. Legal guarantee claims are to be directed to the seller. 
The seller must be informed before legal guarantee claims are processed.  
For processing a legal guarantee claim an exact fault description and the invoice / delivery 
note must be provided. The seller can choose to fulfil the legal guarantee either by repair or 
replacement.  
If the product can neither be repaired nor replaced, or if this does not occur within a 
suitable period in spite of the specification of an extension period in writing by the 
customer, the reduction in value caused by the fault shall be replaced, or, if this is not 
sufficient taking the interests of the end customer into consideration, the contract is 
cancelled. Any further claims against the seller based on this legal guarantee obligation, in 
particular claims for damages due to lost profit, loss-of-use or indirect damages are 
excluded, unless liability is obligatory by German law. 

System voltage 

12 V (24 V) 

Own consumption 

< 4 mA 

Open circuit voltage solar module 
(at minimum operating temperature) 

< 47 V 

Module current 

6 A 

8 A 

10 A 

Load current 

6 A 

8 A 

10 A 

End of charge voltage 

13.9 V (27.8 V) 

Boost charge voltage 

14.4 V (28.8 V) 

Reconnection voltage (SOC / LVR) *³ 

> 50 % / 12.4 V … 12.7 V  

(24.8 V … 25.4 V)

 

Deep discharge protection (SOC / LVD) *³ 

< 30 % / 11.2 V … 11.6 V  

(22.4 V … 23.2 V)

 

Ambient temperature 

-25 °C … +50 °C 

Terminal (fine / single wire) 

4 mm

2

 / 6 mm

2

 - AWG 12 / 9 

Degree of protection 

IP 32 

Dimensions (X x Y x Z) 

145 x 100 x 24 mm 

Weight 

approx. 150 g 

 

*1

 

Solsum is protected against reverse battery polarity together with polarity protected 
loads. Reverse battery polarity combined with short circuited or polarised load could 
cause damages in load or regulator 

*2

 

avoid reverse module polarity in a 24V system 

*3

 

Lower value for nominal current, higher value for lowest curren

Manufactured in a 

 DIN EN ISO 9001:2000 facility 

Solsum / Z02 / Version 09.45 / 730.930