February 24, 20251 yr Hi all Sorry if this was asked in the forum (but not sure how to search the topic). I have a 5kw system with 12 panels, 5kw battery - system works flawlessy - i just wanted some clarification. So the panels is enough for load and charging battery, what happens is in the early evening, the battery would be sitting at 100% - great. Wife would start the cooking (airfryer, microwave) nanny would be cleaning up before she leaves (so vacuum and ironing) - panels powering all appliances. By the time all is said and done - battery would be at +- 97%, but the panels will not charge the battery back up to 100% (even though I just saw how they powered everything else) so there is still enough sun to give it a good charge - Anyone have this issue, or how to resolve it, or is it just a quirk.... Thanks all.
February 24, 20251 yr At this time of year, your solar power is below 50% at 17:00 in Cape Town. Past 18:00 it is dropping like a rock and there is no time left to accumulate charge. Chase the women in your life that they do their chores earlier in the day.
February 24, 20251 yr Author Easier said than done, I expect a narrower charge window in winter - but still perplexing that I can literally see plus 1400watts to power the microwave (for example) and then 2 minutes later, what no charge available for the battery?
February 24, 20251 yr If your battery has started draining, it means that the solar power has been insufficient to supply all the loads for a period of time. Energy is power times time. So, even if you switch off loads, you would have to sustain that charging power for a long enough period to charge the battery... That is the theory. What battery do you have? Some could have fluctuating SoC?
February 25, 20251 yr On 2025/02/24 at 6:32 PM, NadaCT said: Hi all Sorry if this was asked in the forum (but not sure how to search the topic). I have a 5kw system with 12 panels, 5kw battery - system works flawlessy - i just wanted some clarification. So the panels is enough for load and charging battery, what happens is in the early evening, the battery would be sitting at 100% - great. Wife would start the cooking (airfryer, microwave) nanny would be cleaning up before she leaves (so vacuum and ironing) - panels powering all appliances. By the time all is said and done - battery would be at +- 97%, but the panels will not charge the battery back up to 100% (even though I just saw how they powered everything else) so there is still enough sun to give it a good charge - Anyone have this issue, or how to resolve it, or is it just a quirk.... Thanks all. Might be a setting in the BMS that only allows the battery to charge when say the SOC drops below 95%. Try to simulate the behaviour earlier in the day and gradually drop SOC more to see what happens
February 26, 20251 yr Author 14 hours ago, I84RiS said: Might be a setting in the BMS that only allows the battery to charge when say the SOC drops below 95%. Try to simulate the behaviour earlier in the day and gradually drop SOC more to see what happens Thanks will do - i do think that during the midday it does continue charging when you use the battery - it'll take a hit and then continue when the load stops... but I'll have a go.
February 26, 20251 yr Author On 2025/02/24 at 7:22 PM, frivan said: If your battery has started draining, it means that the solar power has been insufficient to supply all the loads for a period of time. Energy is power times time. So, even if you switch off loads, you would have to sustain that charging power for a long enough period to charge the battery... That is the theory. What battery do you have? Some could have fluctuating SoC? It's a greenrich 5kw wall mounted battery.
February 26, 20251 yr @NadaCT, Depending on what Inverter you have, make sure it is set for Priority. You probably need Battery Priority mode (at that time), and Load First at other times, depending on you needs.
February 26, 20251 yr On 2025/02/24 at 7:08 PM, frivan said: At this time of year, your solar power is below 50% at 17:00 in Cape Town. Past 18:00 it is dropping like a rock and there is no time left to accumulate charge. Chase the women in your life that they do their chores earlier in the day. This is the quickest way to make sure batt is at 100% when solar stop producing, but it is difficult with the long haired fairer species ... i have similar problem, but working on it 🤣
February 26, 20251 yr Author 6 hours ago, Sidewinder said: @NadaCT, Depending on what Inverter you have, make sure it is set for Priority. You probably need Battery Priority mode (at that time), and Load First at other times, depending on you needs. It's a sunsynk 5kw inverter ... I'll scoure the settings.
February 26, 20251 yr Author 6 hours ago, Sidewinder said: @NadaCT, Depending on what Inverter you have, make sure it is set for Priority. You probably need Battery Priority mode (at that time), and Load First at other times, depending on you needs.
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