![]() ![]() Running off batteries are very inefficient due to all the losses and time it takes to recharge them, unless you throw a whole lot more panels on to charge them faster. Then I discovered that if I set the SOC too low, say SOC of 80%, it takes too long to recharge the batteries, +-13h00 before fully charged, reducing the savings from running off solar from 9-18h00. Solution for me was a SOC measurement device to stop the yo-yo'ing. Happens because batteries never got charged enough to handle the load early / late afternoon. Late afternoon inverter goes off, panels push the volts up, inverter starts, volts drop very fast, switches off again, charges again. Load on the inverter is +-600va, so it pulls a lot out of batteries, fast.Įarly mornings the volts get quickly up to the set point, inverter starts, volts drop even faster. Solar panels are connected so the problem came about that the system started yo-yo'ing early mornings and late afternoons. unless there's a charger connected to the batteries." Grid tie is just looking for drama - even if the feature is switched off - unless one does it with municipal approval and that makes just no sense ito fees levied by them for that approval, ![]() Will I ever install a Axpert / Mecer / RCT unit? Probably not for:Ī) I prefer my MPPT charge controller separate from the inverter.ī ) Grid tied feature in my opinion is a waste. ![]() Jip, have had parts fail me.Īlso learned that any savings made using solar power, the moment you charge them batteries using Eskom, those savings reduce very fast. Will sort that one day.Īlso, if a part breaks in my design, I can substitute it quite quickly (and with different brands) cost effectively versus having a all in one unit which can be a burden if something fails and the unit must go in for weeks at a time for repairs. Was way overcautious at the time to have a 1sec break instead of 8ms. Victron battery monitor solved my problem using the SOC relay quite nicely.īeen using my design since 2012 with only one flaw. Learned that using volts under load is never a good basis for my application. cycle continues until batteries where flat. As the load disconnects, volts climb, load engages, volts drop, disengages. Time will tell if they last as long as their older brand name solar parts.Īlso learned that running the batts down to a set voltage (I tried with the help of 2 engineers to trigger a relay, which was no problem at all) did not produce the desired results. So yes, the last +-2 years quite a few hybrid units have come on the market, very cost effectively priced, packed with features. Today it is becoming the norm.Īt the time (2008/09) I emailed every local and international supplier of branded systems asking for more cost effective methods of switching between utilities / solar. And none that I could find at the time bar really expensive ones like Outback, Victron with huge additional cost for the parts needed to swap sources. Back in 2008 there where no Axpert/Mecer/RCT branded hybrinds no. ![]()
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