Hi All, looking for some advise please. I'm looking at getting one of the below options:

1. Dyness 14.3kw Lithium power brick (around R30k)

2. Deye SE-F16 16kw Lithium battery (around R32k)

I'm using a Deye 8kw Inverter

Please let me know which you would choose, and why. Thanks!

@mocodo ,

The answer is as always: It depends on your needs!

Owning a very expensive Inverter & even more expensive battery should warrant a decent monitoring system for each component.

Manufactures' efforts (Apps) are basic at best.

Solar Assistant (SA) goes a long way, but from what I can see, both Dyness & Deye batteries mentioned cannot be monitored with SA. If Dyness is mentioned specifically:

Connecting a Dyness / Mecer battery

If an inverter is already reading the Dyness battery, then SolarAssistant can not read the battery at the same time. The battery unfortunetely doesn't support being read from multiple devices at the same time. Set SolarAssistant to "Use inverter values".

This is because once you set up the battery for CAN (to inverter) via dip switches, the RS485 port can only be used a Link port to slave batteries.

Would be nice if some clever ouks can find a way to "fix" this shortcoming.

The Deye battery has a similar port layout to the Dyness (1 x CAN & 2 x RS485), and the Deye battery is not yet mentioned in the SA documentation. Feel free to update this, if anyone know more.

Even so, SA's lack of flexibility and crucial battery information e.g. cell voltages, does not give one the info to know what exactly goes on in a battery, specially during a 24h "charge & discharge" cycle, never mind over 10 years, as these batteries are supposed to last till then. SOH is another metric that is missing in SA.

So, in conclusion, if you never intend to know what goes on in your battery, any of them will do, get the one with the most "bang for buck".

Else get something that you know one will be able to monitor (look for an RS232 port or and additional RS485 port)

5 hours ago, Sidewinder said:

The answer is as always: It depends on your needs!

Personal 2c' worth. Just perusing the spec sheets for both, the key differences are in performance (charge/discharge Amps), and then in lifespan (cycle life and warranty).

Choose the Deye if performance is non-negotiable. It's a 1C charge and 1.2C discharge, normally-rated 230A discharge and peak up to 280A. The Dyness is a 0.5C battery with 140A normal discharge rate, and 200A peak discharge. Choose the Deye if you want to go off-grid, and if you often need/intend to use the full 8kW rated power of the inverter without a fallback.

The Deye is however just rated for 6000 cycles with a 5-year warranty, extendable to up to 10 years, but I'm guessing that would cost extra. There the Dyness is better on paper with unlimited number of cycles and a 10-year cycle life, but read the fine print of how it's tested at 0.2C charging and discharging. Choose the Dyness if you're staying on the grid and peak power can be supported from the grid. Choose Dyness if you will be doing regular deep discharges, like charging electric vehicles, running aircons or geysers, or feeding power to the grid, and if your household demand seldom exceeds 6kW to 7 kW.

Edited February 13Feb 13 by GreenFields

I have the exact same question as the original poster. Looking to replace my 6x 5.5kw Hubbles with 2 of these (maybe a 3rd later on).

I'm leaning more towards the Dyness since it is slightly cheaper, better warranty and can discharge to 95%. My question is: How is their warranty? Has anybody ever needed to use it and how good and fast was the support received?

Also, I see that Dyness has an Android app where you can monitor the battery. Any idea how detailed that thing is compared to Solar Assistant? Does it give both an overview of all the batteries connected to it as well as individual batteries?

As for the 0.5C, 140A/h @ 51.2V translates to 7.1kw/h per battery. I pull at most 5kw in a short burst on the entire system (if I have to microwave something for 3 minutes) since my heavy power usage is during the day, so I should be fine... unless my logic here is flawed?

For anybody interested, I went ahead and bought 2x Dyness Powerbricks. Thus far they seem to be working great. Obviously I can't access the detailed battery information in Solar-Assistant, BUT the Dyness app is very good to see that kind of detail. If I really want that, I can just log into the Dyness app and see detail that is about on par with 1what I used to be able to see in Solar-Assistant. I've attached some screen prints below.

On top of everything, it comes with a built-in fire extinguisher system that responds within 5s.

I replaced 6x 5.5kw batteries with 2 of these and while the total power is about 4kw less than before, I get more usable power out of these since it can discharge to 95%. I am planning to get another one in future though (which is part of the reason for the upgrade... out of wall space). Thus far I'm very happy with the upgrade, but will have to see if I still feel the same way 2 years down the line.