solarman

I have a MultiPlus II 8000, MPPT RS450/100 and 18 x 370w solar panels. I have a 8kw lithium battery bank. I am not allowed to feed into the grid. I don't have a ET112 energy meter installed currently. My whole DB board goes through the system. Critical loads on AC1 and 2 geysers and a small stove on AC2. I live in SA and we have blackouts twice daily for 2 hours Which uses about 30% of my battery bank (maximum). When the geyser and stove switches on the solar power is usually sufficient but sometimes there is a shortfall and is supplemented by the battery instead of the grid. What are my options here? 1) Is there a way to program ESS / another assistant to ensure that the battery is not used for AC2 loads? 2) Do I need to take these loads off the AC2 and bypass the system and then use the ET112 Energy Meter to power these extra loads with excess solar power and grid only. A best practice and long term solution answer will be appreciated. Thanks.

Multiplus II: I don't want to use battery power on AC2 dump load I have a MultiPlus II 8000, MPPT RS450/100 and 18 x 370w solar panels. I have a 8kw lithium battery bank. I am not allowed to feed into the grid. I don't have a ET112 energy meter installed currently. My whole DB board goes through the system. Critical loads on AC1 and 2 geysers and a small stove on AC2. I live in SA and we have blackouts twice daily for 2 hours Which uses about 30% of my battery bank (maximum). When the geyser and stove switches on the solar power is usually sufficient but sometimes there is a shortfall and is supplemented by the battery instead of the grid. What are my options here? 1) Is there a way to program ESS / another assistant to ensure that the battery is not used for AC2 loads? 2) Do I need to take these loads off the AC2 and bypass the system and then use the ET112 Energy Meter to power these extra loads with excess solar power and grid only. A best practice and long term solution answer will be appreciated. Thanks.

The Victron MPPT has a wattage limit, which is the main constraint in this system. 5800W

Hi All, I'm having trouble with a backup system Revov 10.2kW and Victron MP II 5000. No Panels. I've got the following document from Revov. Any other insights you might have regarding the settings of this system? The inverter seems to be tripping for no apparent reason. This is feedback from the site: Sat 21 May power off at 15h40 for approx. 30 secs, Eskom still on. All fine until…. Sat 21 May power off at 18h25 for approx. 30 secs, Eskom still on, power then on for approx. 15 secs and then off again for approx. 30secs. Sequence repeated again and I switch over to Eskom to avoid damage to electronics. Sat 21 May 19h28 reset inverter as it was completely off, switched over to inverter again from Eskom but isolated inverter from mains so it could run off battery. No further issues experienced and left it like this until ….. Sun 22 May 07h43 switched mains back to inverter to charge batteries which were at 71% Sun 22 May at 09h24 power off for approx. 30secs, Eskom still on, batteries at 97%. Again power out at 09h27, Eskom fine , so switched over to Eskom direct and left it like this, which is the current status. I'm trying to establish what could be wrong, faulty inverter, wrong settings or battery issue. The revov technician went to site and said the battery is OK, on the victron forum they said if a MP goes off when SOC is near 100% it could be a cell imbalance. This is why im looking at settings ATM, Any help will be appreciated.

Agree. We have 5 sites where the omnipower batteries failed between 8 months and 20 months. All of these sites the batteries were purchased in the sema time frame (could be the same "batch"). Settings were correct as advised by the battery supplier. Some of these were on axpert charger/inverters some were on victron charger/inverters. I wonder if they didn't have a bad batch or if they moved production to another factory and branded them the same?

Client has 20 x 360w (7200w) panels on the roof (roof, facing north). 5 strings of 4 2 x MPII in parallel SmartSolar MPPT 250|100. ESS system not feeding in to grid. Set to about 70% state of charge for self consumption. Why isn't the PV covering all the day loads? A looks normal in this image, but the B section. The client is using high consumer (iron) during this time. Shouldn't the array handle this consumption? B in image 2. red square in image 1

This is after charging for 10 hours since use, pure backup system, no solar. so I assume float charging then.

I have changed my setting accordingly. My system batteries measures 52.5V with a multimeter. So all seems to be in order?

Thank you sir! I appreciate you helping me out here. Do you have a link or previous post explaining settings 26 & 27 in more details?

Hi, I installed this backup system. I need some feedback on the installation to ensure everything is OK. I used: KODAK Solar Off-Grid Inverter King with UPS 5kW 48V (Axpert) 4 x 240Ah omnipower batteries. 50mm2 Battery Cable 80A Fuse on + battery cable Inverter Settings (Axpert): Program 1 : Utility first (default) Program 2 : 20A Program 5 : User Program 11 : 20A Program 26 : 56.4V Program 27 : 54.8V Program 29 : 44.60V

Hi, I installed this backup system. I need some feedback on the installation to ensure everything is OK. I used: KODAK Solar Off-Grid Inverter King with UPS 5kW 48V (Axpert) 4 x 240Ah omnipower batteries. 50mm2 Battery Cable 80A Fuse on + battery cable Inverter Settings (Axpert): Program 1 : Utility first (default) Program 2 : 20A Program 5 : User Program 11 : 20A Program 26 : 56.4V Program 27 : 56.0V Program 29 : 45V

Thanks @plonkster Yes they currently run off a generator, so that will be used if the weather is not ideal.

I understand (think I do) the calculations for a home off-grid. I want to find out if you put a off-grid system on an remote office where eskom is not an option that runs from 8am to 5pm every day (laptops and printer etc.). How big the battery bank should be. The average daily consumption is 10kwh. Home vs Office example. (bulk of consumption during daytime vs evening) For example, If a home consumes 10kwh a day (24 hour period) which is mostly in the evening (10% day and 90% evening). A battery bank with 200Ah Lead-Acid batteries 12V and a 50% DoD works out to 8,33 batteries needed. So adjusting for inefficiencies, building in a buffer and taking 48V in consideration. 12 Batteries will be used? (This is just taking in consideration 1 day of autonomy for simplicity) How will this change for a battery bank where 90% of the power is consumed during the day?

If the earth was flat the edge would be the biggest tourist destination

@plonkster... I am enlightened. Thanks for the detailed explanation. Much appreciated.