Typically, any SCC requires the batteries to be at a certain Minimum Voltage so that when the SCC starts up it can identify the Voltage Profile it has to load. Each company has "thresholds" and it varies a little. Therefore if the SCC cannot detect the correct voltage it may not start or may start but with the wrong voltage profile.
The Inverter/Charger is voltage specific obviously so voltage sense to start is not an issue. The trick is to get the Charger to start charging the battery bank up. You do not mention if the Inverter/Charger is connected to Grid AC Input or if you have a Genset connection to it for "backup charging". If either is available to the Inverter/Charger then you should really have no issues in charging the batteries and bringing them back up in voltage.
GOTCHA'S (Lessons learned from an FLA days)
- BEFORE charging, check the electrolyte levels and make sure all the cells are topped up per manufacturer spec with pure distilled deionized water. * They may be a slight bit lower than normal because of the low charge, so leave just a hair extra room when topping them up because as they charge & warm up the electrolyte will expand and potential vent out.
- Once these are charged back to a "Normal" voltage, I very highly recommend running a minimum of 2 hours Equalisation Run to ensure a Deep Charge is in there and NOT just a surface charge which is very likely after a full discharge to "empty".
- At least 2 hours AFTER EQ Charge and the batteries have settled to float or no charge at all, check the electrolyte levels again and then test the Acid with the Hydrometer for the Acid Gravity.
- IF the Gravity is not correct (too low) post EQ, you may have to do another EQ Run. If this is the case, do at 1 Hour run at a time and recheck.
BASIC GRAVITY TABLE
% Charge | Specific Gravity |
100 | 1.255-1.275 |
75 | 1.215-1.235 |
50 | 1.180-1.200 |
25 | 1.155-1.165 |
0 | 1.110-1.130 |
Hope it helps, Good Luck.