Sometimes need a small tweak to the voltage of the inverter/charger. A couple people have had some issues but most of the time they work straight out of the box. They have a BMS to control the charging and discharging of the lithium cells. If you get the lead replacement lithium batteries they should work. This is super useful to understand your power usage. There are a couple online calculators that can help. In summary you have to significantly "oversize" your batteries. The lifetime of a gel battery will also be significantly impacted if you discharge to below 50% DOD. I couldn't find a spec sheet for your batteries but this might help: Gel (similar to lead acid) suffers from a high internal resistance so the greater the current draw the lower the battery capacity. The stated capacity of most batteries is quoted assuming a discharge over a 20 hour period - 0.05C. I don't have a clue on the power consumption but safe to say it is a lot more than the 40W odd that my laptop uses. 🤣 So I maintain that your panels may just not generate enough Voltage to get the MPPT to generate anything under load. It starts with a baseload of around 500W.In the voltage graph after that you will see around 260V.įrom about 12:10 there was a fairly constant 3000W load and you will see the Voltage drop down to sometimes 230V. In the second set of graphs I try to show the voltage drop under load. Yes, the early morning sun is still weak, so not much to be expected even at higher voltage. The first time I got above 10W was at 05:18 by which time the Voltage was fluctuating between 180 and 240V. However note this mornings voltages and during the same time period, the amps and watts.
Fluke voltage tester series#
I have 6 panels in series meaning a lab condition max of 300V. As soon as the load increases your voltage drops, and that drop may just end up below the minimum required. I reiterate, as soon as your solar energy and voltage is sufficient, the Inverter will pull the max MPPT curve for those values and try and charge the batteries.
Assuming your panels are 50V, then under ideal conditions you can expect 150V ignoring any losses.ĭoes that voltage exceed your Inverter start up voltage ? Then deduct 10 - 20% for real world conditions and that should be your expected Voltage. Look again at your three panels VOC and in series add that up. So if that is your data, then the solar production graph is rubbish. Your three panels add up to 1740W in lab conditions. Looking at the one solar spike in your graph indicates an erroneous reading.
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