DouglasBray

Just a thought... As you guys are talking about different Chargers etc... Why not consider a Cheap All in one Inverter that probably has Battery Monitoring and a Higher Rated Charger along with the option of a built in MPPT. Then you have a more valuable asset that can be re-tasked or re-sold when your building is done....

Some inverters enable Mains Bypass Feature and can supply loads in excess of what the Inverter itself can produce. If your inverter complains or trips than yours is not one of those😉 Most inverters have "Dry Contact" relays that can activate all sorts of cool accessories like contactors so you can have heavier load circuits drop out or in depending on the supply conditions. You can also use things called Energy Control Units to drop Circuits that only occasionally use high current appliances. There is no end to the Creativity of a good Electrician! 😀

Your Typical 100A Deep Cycle Battery has a Maximum Charge Rate of 25A. For each Battery you place in Parallel you add the Charge rate (This is Roughly accurate and there are a number of factors that could influence this). So Effectively you are charging 300Ah Battery with 5A Charger (about 30 Hours to Charge from 50% or 15Hours to charge from 25% - again roughly and depending on so many factors). You really want to charge at around 50-80% of the Maximum of the Battery, so in your case 30-40A Charger. These are just basic figures to help you understand, there are a number of Engineering Factors that still need to come into play, but if you look at it from this perspective: the amount of power you take out during load shedding is the same amount of power you must put back in while the power is on as long as it does not exceed the Battery or Charger Specifications (I like to use 50% of the Specified Maximum Values to be safe - Yes I know, I Over Engineer Everything, But is lasts...)

Hi Martin, First of all can you tell us a little about your system, Inverter, Load Etc.... Typically SLA Batteries should only Cycle to 50% and then the expected life cycle is between 150-450 (for Cheaper brands) and 800-1000 (for high quality true Deep Cycle) depending on the brand before you start to see some sort of degrading of capacity. In more recent Typical Load Shedding, depending on your load, this translates to 3 or more Cycles per day. So your lifecycle seems to be accurate and normal. If the Depth of Discharge (DoD) is limited to 20% then you can see a huge improvement of lifespan. The Reality is that High Quality SLA Batteries if only used to their recommended safe DoD can last 10+ Years, But lets get real, no one buys that many batteries for their systems so they end up "overworking" the batteries and they fail faster, its a matter of chemistry and engineering and can be pretty reliably predicted. Lithium Batteries are far more tolerant of frequent, and deeper cycles than SLA. Sure they cost more but do they really when you consider the cost of a huge bank of High Quality Lead Based Batteries. So before spending money on a BMS system that is only going to cut off the load before the damage point of the DoD, and reduce the available time the load is supplied in order to save the battery, you may want to look at a Lithium Drop-in replacement option that has built in BMS and gives you the same or more capacity in the same footprint.

I'll keep at it with the Guys from CFE from my side... I have a stable system in the wild using the LuxPower with the CFE (2 Months now). I also want to use 2x CFE with a Kodak 7.2 Max (Axpert Max) and see what I can find. Do you know what firmware the Synapse 7.2M+ (Axpert Max) is running?

Any News on this configuration? Are you still just using Manual?