Posted March 27, 20205 yr Hi all, I have an Axpert 4k being fed by two arrays and charging two 7.4kWh Solar MD lithium batteries. Between approx 10h50 and 12h30 the Axpert shows the PV array giving 2.45 to 2.65 kW charge and staying there. If I disconnect an array and then reconnect, the Axpert shows 3.74kW being 2.3kW from one array and 1.44kW from the other. The batteries are at 68%. The inverter then carries on happily all day and the batteries are 100% by 14h00. We then irrigate and heat water until 17h00 using the panels leaving the batteries fully charged. This happens every day. The inverter was in parallel and connected to the low power array so this was not noticed. Now we are back to one inverter. The inverter uses a Solar MD data logger and for a while it was running under Ai control. The guys at Solar MD tried all sorts of settings but to no avail so now we are back to normal. Charge setting is 80A. Has anyone seen this type of behaviour before. My previous RCT Axpert was connected like this for two years and never had this problem.
March 28, 20205 yr 16 hours ago, Tony Swash said: an Axpert 4k Please be more specific. 4 kVA or 4 kW? PF0.8 or 1.0? Scc 145 V or 450 V max? 16 hours ago, Tony Swash said: the Axpert shows 3.74kW being 2.3kW from one array and 1.44kW from the other. So these arrays have slightly different panel specs? How many in series? 16 hours ago, Tony Swash said: PV array giving 2.45 to 2.65 kW charge and staying there. If I disconnect an array and then reconnect, the Axpert shows 3.74kW Interesting. The act of disconnecting might be causing it to do a long ramp, and with the typical Axpert overshoot, it may overload the SCC for just long enough to "get it over the hump" to pull the array voltage below the ramp down voltage. But without additional information, that's just a guess. 16 hours ago, Tony Swash said: My previous RCT Axpert was connected like this for two years and never had this problem. "like this" as in the two arrays in parallel? What were the specs of this RCT inverter-charger? Edited March 28, 20205 yr by Coulomb
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.