Tesla Powerwall and Freedom Won home battery comparison

quovadis said:
There are tons of options in terms of power generation in the North American market which is why they sell both with a MPPT inverter and without otherwise you end up with an inverter and an unused MPPT.
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Why sell the wrong one in SA then? I'm assuming only the non-mppt is available here or are there both?
 
wingnut771 said:
Okay but they can burn more cheap coal at night then?
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Ideally all coal power stations have a minimum spec for coal - using cheap coal just causes damage and reduces efficiency. You're not wrong that you can probably shift the load but the more who do the more the problem just shifts plus additional inefficiency each time you drain or charge the battery compounds the issue. We need grid-tied generation and storage.
 
quovadis said:
Ideally all coal power stations have a minimum spec for coal - using cheap coal just causes damage and reduces efficiency. You're not wrong that you can probably shift the load but the more who do the more the problem just shifts plus additional inefficiency each time you drain or charge the battery compounds the issue. We need grid-tied generation and storage.
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So what you're saying is we're ****ed and should start prepping our bunkers?
 
It Takes a lot more than just an inverter and battery to get a back up / solar solution going. ... and needs plenty of wall space. Not really a great comparison of two lots of premium equipment.
 

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wingnut771 said:
maintenance takes weeks though.
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Option 2 then... probably a take-or-pay on wind generation. Now you could rather that they could then have reduced the load-shedding stage at that time and kept the coal going.
 
Crimson & Blue said:
A solar inverter - i.e. basic inverter that incorporates MPPT. AFAIK it takes AC input for charging.
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An inverter converts AC to DC and vice versa but it doesn't handle DC from a solar array, which is what an MPPT does as it is a DC to DC converter, some 'inverters' have these two combined while others have them separate. The Tesla Powerall 2 has an inverter but no MPPT so an entire inverter with built in MPPT seems a waste of money if you can get away with simply using an MPPT.
 
Neuk_ said:
An inverter converts AC to DC and vice versa but it doesn't handle DC from a solar array, which is what an MPPT does as it is a DC to DC converter, some 'inverters' have these two combined while others have them separate. The Tesla Powerall 2 has an inverter but no MPPT so an entire inverter with built in MPPT seems a waste of money if you can get away with simply using an MPPT.
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Ag jinne piet man :laugh:
I did say a solar inverter. An inverter with integrated MPPT. Would you call a Sunsynk inverter an inverter? Did you know it incorporates MPPT charge controllers and you can't get it without?
A smaller 3.6kw sunsynk inverter will do fine. Don't tell me you're worried about spending R20k to connect solar when you've just forked out R170+k for the battery and inverter. In that case you're not in the market for Tesla.
 
Crimson & Blue said:
Ag jinne piet man :laugh:
I did say a solar inverter. An inverter with integrated MPPT. Would you call a Sunsynk inverter an inverter? Did you know it incorporates MPPT charge controllers and you can't get it without?
A smaller 3kw sunsynk inverter will do fine. Don't tell me you're worried about spending R20k when you've just forked out R170+k for a powerwall. In that case you're not in the market for Tesla.
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Ag jinne piet jouself :laugh:

I would never be in the market for a Tesla Powerwall, as good looking as they are, they are simply not worth the money. I was merely asking to understand what is needed to have solar integrated with a Powerwall that does not have an MPPT. Buying an entire 'solar' inverter as you call them, to integrate solar in to a Powerwall is completely idiotic, even if you ignore the cost side of things. If you can do it with just an MPPT that is a different story, a still very expensive story for what you get when 'uglier' systems will do more for less money.
 
Neuk_ said:
Basic inverter or MPPT?
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What he means is you already have a large inverter in the Powerwall to do DC > AC for the house.

You only need a small inverter and MPPT to add Solar to the Tesla and not a monster that runs the whole house so it can be quite barebones.

Actually not sure you need an inverter at all? It’s surely just going to be DC > DC.
 
yogidabear said:
Powerall+ supposedly does address the powerwall 2 shortcomings, but no idea if they in SA or the price.

The victron price quoted may not have included the mppt but you can use some of the 20k savings in the article to buy it at +-5k. Was just trying to highlight most people dont know the powerwall 2 doesnt have any mppt, and it takes a while to switch over. There are many other solutions as being mentioned.
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What do you mean switch over? It’s an AC coupled system so there’s nothing to switch.

Everything runs “through” the battery.
 
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