Time to do a another calculation again. (previous posts here, here and here) - but this time, I will go cheap (but with cells available in Europe - I'll do an international Alibaba version at some point).
Disclaimer, as usual: I mention vendors below and use them as an example and as reference. This should not be considered an endorsement of said vendors!
We again start again with leveling the playing field. I'll go with SOK again (because we don't have many other options), like last time. A 5kW SOK rack mount battery is currently retailing at 1699 Euro (100 Euro cheaper than last July). The shipping cost seems to be a flat 50 Euro per battery, so we'll add that making the total 1749 Euro.
As before, we want to be able to build a battery with popular cells such as the 280/304Ah EVE and similar. To have the same capacity for comparison, we can build a 15kWh battery pack. That means we also need three of the SOK batteries for this comparison, so that brings the total for the off-the-shelf 15kWh battery to 5247 Euro.
For our DIY pack, we go with cells from NKON again. We want cheap, so we're going with grade B cells, 280Ah Envision cells, for €72,95 each in single unit quantities. We will need 16 to have an approximate 15kWh pack, which brings the cost per cell down to 69 Euro for a total of 1104 Euro. Shipping for this (to Finland) costs €114.14, for a total of 1218.14 Euro.
As before, I'm sticking to the JK BMS. The 200A with 2A balancing would set me back €145 with free shipping based on current prices at Hankzor on Aliexpress.
Since class T fuses are still difficult to get, I'm going to go with BS88 fuses again, 125LET Eaton Bussman. These are readily available from Farnell, RS, TME, etc. At Farnell I can buy them for 45.77 Euro total including shipping and VAT.
I'm going to skip the DC breaker, even though I could find a cheaper one than the 200 Euro Elmark I picked last time...
That brings the total to 1408.91 Euro including all shipping and VAT for the DIY system (or about 94 Euro per kWh), versus 5247 Euro for the SOK system. Even if we add the Elmark breaker back in at 200 Euro, we're at 1608.91 Euro for the DIY pack, or 30% of the cost of the SOK system. Now, if we could get an EG4 at the same price they're currently at across the pond (1156 Euro, let's assume this includes shipping) DIY would still be at around 50% of the price compared to off the shelf.
And yes, grade B cells - you may need a couple of extra spare cells just in case. As usual, it's up to you to decide if it's worth it, and worth your time and effort to build it or buy off-the-shelf.
Disclaimer, as usual: I mention vendors below and use them as an example and as reference. This should not be considered an endorsement of said vendors!
We again start again with leveling the playing field. I'll go with SOK again (because we don't have many other options), like last time. A 5kW SOK rack mount battery is currently retailing at 1699 Euro (100 Euro cheaper than last July). The shipping cost seems to be a flat 50 Euro per battery, so we'll add that making the total 1749 Euro.
As before, we want to be able to build a battery with popular cells such as the 280/304Ah EVE and similar. To have the same capacity for comparison, we can build a 15kWh battery pack. That means we also need three of the SOK batteries for this comparison, so that brings the total for the off-the-shelf 15kWh battery to 5247 Euro.
For our DIY pack, we go with cells from NKON again. We want cheap, so we're going with grade B cells, 280Ah Envision cells, for €72,95 each in single unit quantities. We will need 16 to have an approximate 15kWh pack, which brings the cost per cell down to 69 Euro for a total of 1104 Euro. Shipping for this (to Finland) costs €114.14, for a total of 1218.14 Euro.
As before, I'm sticking to the JK BMS. The 200A with 2A balancing would set me back €145 with free shipping based on current prices at Hankzor on Aliexpress.
Since class T fuses are still difficult to get, I'm going to go with BS88 fuses again, 125LET Eaton Bussman. These are readily available from Farnell, RS, TME, etc. At Farnell I can buy them for 45.77 Euro total including shipping and VAT.
I'm going to skip the DC breaker, even though I could find a cheaper one than the 200 Euro Elmark I picked last time...
That brings the total to 1408.91 Euro including all shipping and VAT for the DIY system (or about 94 Euro per kWh), versus 5247 Euro for the SOK system. Even if we add the Elmark breaker back in at 200 Euro, we're at 1608.91 Euro for the DIY pack, or 30% of the cost of the SOK system. Now, if we could get an EG4 at the same price they're currently at across the pond (1156 Euro, let's assume this includes shipping) DIY would still be at around 50% of the price compared to off the shelf.
And yes, grade B cells - you may need a couple of extra spare cells just in case. As usual, it's up to you to decide if it's worth it, and worth your time and effort to build it or buy off-the-shelf.
