Hi all, first let me just say what a great site this is with a wealth of knowledge.
I have been lurking on the forums for a while and have read a lot of the topics, some more than a few times and have started to form a picture of what I think would be a good system (cheap but with decent components that should last a while) for me to beat the load shedding blues. I would however love some input and some of the expert users on here to give me some guidance.
My use case is as follows;
When we are load shedded (usually for 2.5 hrs at a time) I need / would like to be able to run Lights, Internet / Wifi / Computers, Tv's etc.
I have installed an energy monitoring device to check what my consumption is in this situation. I have a idle consumption with the fridges, few lights etc. of around 500 Watt that goes up to around 1000 Watt max with all of the above loads.
My plan is to switch of all the large circuits (Geysers, Heaters, Stove, Oven, Pool Pump, at the main DB board before switching to the backup).
I currently use a small inverter petrol generator to power this equipment and have been running it with an extension cord which is messy. I therefore have just installed Manual Transfer Switch so that i can hook it up to the house supply, this makes it more convenient but is still messy (have to refuel, service generator, its noisy etc. (I live in a complex so we are not allowed to run in after before 8 in the morning or after 8 in the evening).
I therefore want a bare bones system that could power these loads but flexible if i want to grow it in future.
My thinking currently is to use a off grid/hybrid system (hope the terminology is correct) that I can switch to with the manual transfer switch just to run the critical circuits (by manually disabling the circuits not needed in main db);
I am thinking of the following main components and see the pricing to be around the following,
1 x Axpert VM111 or MAX R15K
1 x Pylontech 4.8KW Battery R22K
4 x 540W Solar Panels R12K
i know i would need, battery dis connector, breakers, fuses cancelling etc. as well
I am thinking of a Axpert Inverter either the VMIII or the MAX at 5KW and 7.2KW this might seem like overkill for my purpose but at around 12K to 15K it seems i might as well go for the bigger one.
My thinking on the inverter is that these have the ability to blend power, solar and battery, or use solar only during the day to run my loads during load shedding. Also I need the capability to limit the current draw from the battery as the Pylontech is only 0.5C, I know there is a Hublle battery capable of 1C available but that uses a different chemistry that I understand wont last as long (many cycles in my use case as my Load is like 1000 watt so even at 0.5C I would be able to draw 2400 watt from the battery).
I have looked at the sunsynk but from a cost and functionality for my requirement I think the axpert is better suited.
I would love to hear the opinion of some of our AXpert fundi's on their opinion with regards to if it is worth going for the MAX over the VMIII. I would also appreciate if someone could confirm that I can Limit the current on the VMIII as this might effect my decision with regards to the battery. Also some guidance as i see teh units branded as koaqd, axpert, meccer RCT etc. what would the recommendation be for a good suplier.
From a battery perspective as mentioned I am leaning towards the 4.8KW Pylontech purely based on the chemistry and the real world testing that shows these perform quite well, the other I considered was the Hubble, but being quite new i am not sure if it has a proven track record yet. I could also not find the warranty information / comparable cycles on the shop or the vendor website or the data sheet manual. from the internet, YouTube etc. it seems the chemistry at lower .c rating does not provide the same cycles. I am open to change on this as the price is not too different and only slightly more expensive per kw but as I weren't able to find a definitive answer on the cycles, guarantee of the battery. I hope the resident Hubble experts will chime in. I quite like the form factor of the Hubble as I plan to wall mount anyway.
Then lastly I want to add a few of the highest power output panels as I have limited space to put them, this will be used purely to charge the battery and power during mid day load shedding using the blending magic, I will probably only add this at a later stage and first charge the battery from the grid and use it this way. If i add the panels this may allow me to run my aircon in the summer during load shedding ect. as well and the panels will allow me not to have to pay to have the batter charged.
This is obviously a grudge purchase for convenience and not to save money by reducing my Eskom bill but to allow me to work during load shedding especially at night.
Thanks for taking the time to read my ramblings and look forward to your comments.